JP5839673B2 - Water heater - Google Patents

Description

The present invention relates to a water heater that supplies hot water by heating water.

A water heater that heats water using the heat of the burner device and supplies hot water to a hot water tap (faucet or shower) is powered by a fan that supplies air to the combustion section of the burner device, a remote controller for operation, etc. Many electric devices that are supplied and actuated are provided (for example, see Patent Document 1).
The water heater operates these electric devices with electric power from a commercial power source and supplies hot water at a predetermined temperature to the hot water tap.

JP2011-163711A

However, the power supply from the commercial power supply may stop due to disasters, accidents, etc., and conventional water heaters cannot supply hot water to the hot water tap when the power supply from the commercial power supply stops. There was a problem.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a water heater that includes a secondary battery and that operates using electric power stored in the secondary battery and supplies hot water in the event of a power failure.

A water heater according to the first to third aspects of the present invention includes a fan, a combustion part to which air is supplied from the fan, a supply amount adjusting means for adjusting the flow rate of combustible fuel sent to the combustion part, and an ignition means. A hot water storage tank in which hot water is boiled by the burner device, and a secondary battery that is charged by being supplied with electric power from a commercial power source. The hot water in the hot water storage tank is heated by the electric power supplied from the commercial power source, and the hot water in the hot water storage tank is heated by the electric power supplied from the secondary battery in the event of a power failure. An upper limit is set for the number of times of boiling the hot water in the hot water storage tank performed for one power failure.

According to a first aspect of the present invention, there is provided a water heater according to a first aspect of the present invention, wherein the hot water in the hot water storage tank is turned on by a specific operation switch even after the number of times of boiling of the hot water in the hot water tank, which has been performed per power failure, reaches the upper limit. Is ready for boiling.

Water heater according to the second invention, although raised boiling of the hot water of the hot water storage tank at the time of power failure, when the temperature of the hot water in the hot water storage tank is below a predetermined value, based on the temperature of the hot water in the hot water storage tank When the temperature of the hot water in the hot water storage tank exceeds the predetermined value, the hot water storage tank is operated in accordance with the timing at which the hot water is discharged.

In the water heater according to the second invention, when the temperature of the hot water in the hot water storage tank is not more than the predetermined value at the time of a power failure, a temperature lower than normal is set as a temperature at which the hot water in the hot water storage tank starts to be heated. It is preferable to boil the hot water in the hot water storage tank.

Water heater according to the third invention, the raised boiling hot water of the hot water storage tank, but both during normal and during a power failure, is started on the basis of the temperature of the hot water in the hot water storage tank, water heating in the hot water of the hot water storage tank The temperature at which to start the operation is lower during a power outage than during normal operation.

In the hot water heaters according to the first to third inventions, it is preferable that the combustible fuel is a liquid fuel and the supply amount adjusting means is a pump.

In the hot water heaters according to the first to third inventions, the burner device operates by being supplied with power from the secondary battery at the time of a power failure, and boils the hot water in the hot water storage tank, so that it is stored in the secondary battery at the time of a power failure. It is possible to supply hot water using the generated electric power.
In addition, since there is an upper limit for the number of times the hot water in the hot water tank is heated per power outage, the number of times the hot water in the hot water tank is heated during a power outage is limited. Consumption can be suppressed.

Water heater according to the first invention, even after the number boiling hot water of the hot water storage tank made at a time of power outage has reached the upper limit, boiling of the hot water of the hot water storage tank by a particular activation switch Therefore , it is possible to avoid a situation in which the hot water in the hot water storage tank cannot be heated up even though power remains in the secondary battery.

Water heater according to the second invention, although raised boiling hot water of the hot water storage tank at the time of power failure, when the temperature of the hot water in the hot water storage tank exceeds a predetermined value, the hot water storage tank is performed in accordance with the timing of tapping, It is possible to reduce the number of times the hot water in the hot water tank is boiled due to the decrease in the temperature of the hot water in the hot water tank due to heat dissipation, and to suppress the consumption of the electric power stored in the secondary battery due to the operation of the burner device it can.

In the water heater according to the second invention, when the temperature of the hot water in the hot water storage tank is below a predetermined value at the time of a power failure, a temperature lower than normal is set as a temperature at which the hot water in the hot water storage tank starts to be heated. When boiling the hot water in the tank, the number of times of boiling the hot water in the hot water storage tank can be reduced, and the consumption of electric power stored in the secondary battery can be suppressed.

Water heater according to the third invention has raised boiling hot water of the hot water storage tank, both during normal and during a power failure, is started on the basis of the temperature of the hot water in the hot water storage tank, start the boiling of the hot water of the hot water storage tank temperature, because power failure is lower than the normal time, and reduce the number boiling in hot water in the hot water storage tank at the time of power failure, it is possible to reduce the consumption of power stored in the secondary battery.

In the hot water heater according to the first to third inventions, when the combustible fuel is a liquid fuel and the supply amount adjusting means is a pump, an energy saving effect is reliably obtained by limiting the number of times the hot water in the hot water storage tank is boiled. be able to. This is because, in general, the pump is an electric device with large power consumption among the electric devices that consume electric power provided in the water heater.

It is explanatory drawing of the water heater based on one embodiment of this invention. It is a block diagram which shows the signal connection of a microcomputer.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 and 2, a water heater 10 according to an embodiment of the present invention includes a fan 11, a combustion unit 12 to which air is supplied from the fan 11, and a liquid fuel (combustible fuel) sent to the combustion unit 12. A burner device 21 having a pump (an example of supply amount adjusting means) 13 and an igniter (an example of ignition means) 13a, a hot water storage tank 14 in which hot water is boiled by the burner device 21, And a secondary battery 16 that is charged with power supplied from a power source 15. Details will be described below.

As shown in FIG. 1, the water heater 10 includes a hot water storage tank 14 to which water is supplied from a water supply pipe 17 through a pressure reducing valve 18, and a combustion chamber 19 is formed in the lower part of the hot water storage tank 14.
The combustion chamber 19 is provided with the combustion section 12 of the burner device 21. The combustion section 12 supplies combustion gas generated by burning liquid fuel (kerosene in the present embodiment) to the combustion chamber 19 to store hot water. The hot water in the tank 14 is heated. The combustion chamber 19 includes an exhaust mechanism (not shown) that discharges combustion gas.

A pump 13 that supplies liquid fuel to the combustion unit 12 is connected to the combustion unit 12, and a fan 11 that sends air to the combustion unit 12 is attached. The combustion unit 12 can burn the liquid fuel when the liquid fuel is supplied by the pump 13 and the air is supplied from the fan 11.
The hot water storage tank 14 is provided with a temperature sensor 20 for measuring the temperature of the hot water in the hot water storage tank 14, and at the normal time (that is, when power is output from the commercial power supply 15), the burner device 21 is connected to the temperature sensor 20. When the measured temperature falls below a predetermined temperature, the combustion unit 12 is burned, and the hot water in the hot water storage tank 14 is slightly higher than the temperature set by a remote controller (hot water remote controller 45 or bathroom remote controller 46) described later. Keep in the temperature range.
The burner device 21 is provided with an igniter 13a (see FIG. 2). In the present embodiment, the burner device 21 in which the combustion unit 12, the pump 13, the fan 11, and the igniter 13a are integrated is used. . In FIG. 1, the igniter 13a is not shown.

The hot water storage tank 14 is connected to a hot water supply passage 24 that supplies hot water of a set temperature to the faucet 22 and the shower 23, and a hot water supply passage 26 that supplies hot water to the bathtub 25 is connected to the hot water supply passage 24. .
The hot water supply passage 24 is provided with a mixing valve 29 that mixes water with hot water sent from the hot water storage tank 14 and a proportional valve 30 that adjusts the flow rate of hot water flowing through the hot water supply passage 24.
When the hot water from the hot water storage tank 14 exceeds the set temperature, the water is mixed with the hot water from the hot water storage tank 14 by the mixing valve 29, and the temperature of the hot water supplied to the faucet 22 and the shower 23 is lowered. The proportional valve 30 adjusts the flow rate of hot water flowing through the hot water supply passage 24 by changing the opening degree.

The water supply pipe 17 is provided with a temperature sensor 31 for measuring the temperature of water supplied to the mixing valve 29, and the hot water supply passage 24 is provided with a temperature sensor 32 for measuring the temperature of hot water discharged from the hot water storage tank 14. Is provided.
Further, the hot water supply passage 24 is provided with a temperature sensor 33 for measuring the temperature of the hot water discharged from the mixing valve 29, and whether or not the temperature of the hot water supplied to the faucet 22 or the shower 23 is a set temperature. It can be detected by the temperature measured by the temperature sensor 33. The mixing ratio of hot water and water in the mixing valve 29 is determined based on the measured temperatures of the temperature sensors 31, 32 and 33.

The hot water filling channel 26 is provided with an opening / closing valve 34. When the opening / closing valve 34 is opened, hot water from the hot water storage tank 14 is sent to the bathtub 25 through the hot water filling channel 26 and hot water filling is performed. While the hot water filling to the bathtub 25 is performed, the temperature of the hot water sent from the hot water storage tank 14 to the bathtub 25 is measured by the temperature sensor 33. The combustion level of the burner device 21 is adjusted based on the measured temperatures of the temperature sensors 20, 32, and 33 so that hot water of a predetermined temperature is filled in the bathtub 25.
And when hot water filling to the bathtub 25 is completed, the on-off valve 34 is closed.
The hot water flow path 26 is provided with a backflow prevention means (not shown) for preventing the hot water in the bathtub 25 from flowing backward when the water is shut off, on the downstream side of the on-off valve 34.

The water heater 10 is operated with a number of electric appliances (power is supplied thereto) including a pump 13, a fan 11, an igniter 13a, an on-off valve 34, a mixing valve 29, a proportional valve 30, and temperature sensors 20, 31 to 33. Equipment), and a control device 35 is connected to these electric appliances.
The control device 35 includes a power supply circuit 36 that electrically connects the commercial power supply 15 and the electric device, and a microcomputer 37 (an example of a computing unit) on which various programs are mounted. The power supply circuit 36 and the microcomputer 37 are also electric devices.

At normal times, that is, when the commercial power supply 15 is in a state in which power can be supplied, power is supplied from the commercial power supply 15 to the electric devices other than the power supply circuit 36 via the power supply circuit 36.
As shown in FIG. 2, the microcomputer 37 is signal-connected to the pump 13, the fan 11, the igniter 13a, the on-off valve 34, the mixing valve 29, the proportional valve 30, and the temperature sensors 20, 31 to 33, and transmits a command signal. Thus, these electric devices can be operated.

As shown in FIG. 1, the water heater 10 is provided with a secondary battery 16, and power is supplied from the secondary battery 16 to the electric device when a power failure occurs, that is, when the power supply from the commercial power supply 15 is stopped. Is done.
The secondary battery 16 is charged by supplying power from the commercial power supply 15 at normal times. As the secondary battery 16, a lead storage battery, a lithium ion secondary battery, or the like can be adopted.

Between the commercial power supply 15 and the secondary battery 16, a converter 38 that converts AC power output from the commercial power supply 15 into DC power is provided, and DC power is output from the converter 38 to the secondary battery 16. .
An inverter 39 is provided on the power output side of the secondary battery 16. The inverter 39 operates by being supplied with power from the secondary battery 16 at the time of a power failure, and converts DC power output from the secondary battery 16 into AC power. The AC power output from the inverter 39 is supplied to the power supply circuit 36.
Normally, no power is supplied to the inverter 39, and the inverter 39 is in a stopped state.

Between the inverter 39 and the control device 35, a switch 40 for switching a power supply source to the power supply circuit 36 is disposed.
The switch 40 electrically connects the inverter 39 and the power supply circuit 36 when the power supplied from the commercial power supply 15 is cut off. When the power supply from the commercial power supply 15 is resumed while the inverter 39 and the power supply circuit 36 are electrically connected, the switch 40 electrically connects the commercial power supply 15 and the power supply circuit 36. . By switching the switch 40 in this way, power from the commercial power supply 15 is supplied to the power supply circuit 36 at normal times, and power from the secondary battery 16 is supplied to the power supply circuit 36 via the inverter 39 at power failure. To be.

Further, as shown in FIG. 1, the secondary battery 16 is electrically connected to a service outlet 41 via an inverter 39. The hot water heater 10 can convert the DC power from the secondary battery 16 into AC power by the inverter 39 and supply the converted AC power to an external device via the service outlet 41 during a power failure.
Note that the secondary battery 16, the converter 38, and the inverter 39 are disposed in the housing 42 together with the control device 35, the burner device 21, and the like.

An air supply path 43 through which air is taken in from the outside by the operation of the fan 11 is formed in the housing 42, and the secondary battery 16 is disposed on the upstream side of the fan 11 in the air supply path 43. Therefore, the secondary battery 16 is air-cooled by the air flowing through the air supply path 43 while the fan 11 is operating.
A temperature sensor 44 that is electrically connected to the power supply circuit 36 is attached to the secondary battery 16. The temperature sensor 44 is one of electric devices that are signal-connected to the microcomputer 37, operates by being supplied with electric power from the commercial power supply 15, and measures the surface temperature of the secondary battery 16.

When the surface temperature of the secondary battery 16 obtained from the temperature sensor 44 is equal to or higher than a predetermined temperature (for example, a predetermined temperature of 40 ° C. or higher), the microcomputer 37 normally supplies the liquid fuel to the burner device 21. Even in the non-burning state, the fan 11 is operated to air-cool the secondary battery 16.
Therefore, the secondary battery 16 is suppressed from continuing the high temperature state.
Since the secondary battery generally has a short life when the high temperature state continues, the air cooling by the fan 11 is effective in extending the life of the secondary battery 16.
In the present embodiment, power is not supplied from the secondary battery 16 to the temperature sensor 44 at the time of a power failure (that is, the surface temperature of the secondary battery 16 is not measured), and the operation of the fan 11 is performed by the burner device 21 being liquid. The design is limited only when the fuel is burned, and the consumption of the electric power charged in the secondary battery 16 is suppressed.

As shown in FIG. 2, a hot water remote controller 45 disposed in a living room or a kitchen and a bathroom remote controller 46 disposed in the bathroom are signal-connected to the microcomputer 37.
The user of the water heater 10 can set the hot water temperature of the bathtub 25 and the temperature of hot water supplied to the faucet 22 and the shower 23 by operating the hot water remote controller 45 or the bathroom remote controller 46. The hot water remote controller 45 and the bathroom remote controller 46 have a display unit for displaying the input temperature and the like, and an input button for performing an input operation.
The hot water remote controller 45 and the bathroom remote controller 46 are also electrically connected to the power supply circuit 36, as shown in FIG. 1, and are normally supplied with power from the commercial power supply 15 and during a power failure, The power is supplied from the secondary battery 16 to operate.

In normal times, hot water supply to the shower 23 and the faucet 22 and hot water filling to the bathtub 25 are respectively started by predetermined operations.
During a power failure, hot water filling to the bathtub 25 is prohibited, and only hot water supply to the shower 23 and the faucet 22 is possible. Specifically, the power supply from the secondary battery 16 is not supplied to the on-off valve 34 that is used when filling the bathtub 25 with hot water during a power failure, and is used when hot water is supplied to the shower 23 and the faucet 22. Electric power is supplied from the secondary battery 16 to the electric device as required. This is due to the design concept that priority is given to hot water supply to the shower 23 and the faucet 22 in the event of a power failure.

The burner device 21 normally operates with power supplied from the commercial power supply 15 to boil the hot water in the hot water storage tank 14, and operates with power supplied from the secondary battery 16 during a power failure. Boil the hot water.
A preset upper limit value (1 to 3 times in the present embodiment) is provided for the number of times of hot water boiling in the hot water storage tank 14 performed for one power failure. For this reason, when the boiling of hot water in the hot water storage tank 14 performed during a single power failure reaches the upper limit value, the hot water in the new hot water storage tank 14 is not heated in principle until the power failure ends. This is because the operation of the burner device 21, that is, the fan 11, the pump 13 and the igniter 13 a involves the power consumption of the secondary battery 16, so that the boiling of the hot water in the hot water storage tank 14 is avoided without restriction. Because.

However, even after the boiling of hot water in the hot water storage tank 14 that has been performed during a single power failure reaches the upper limit, the hot water in the hot water storage tank 14 is heated by a specific operation switch. be able to.
The specific operation switch is a specific input button provided on each of the hot water remote controller 45 and the bathroom remote controller 46, and the user of the water heater 10 operates the specific input button to operate the hot water in the hot water storage tank 14. It is possible to bring it into a state where it is heated. This is to make the user recognize when boiling water in the hot water storage tank 14 exceeding the upper limit.

In the present embodiment, the timing of boiling the hot water in the hot water storage tank 14 at the time of a power failure differs depending on the temperature of the hot water in the hot water storage tank 14.
When the temperature of the hot water in the hot water storage tank 14 is below a predetermined value, the boiling of the hot water in the hot water storage tank 14 is performed based on the temperature of the hot water in the hot water storage tank 14 at the time of a power failure.
When the temperature of the hot water in the hot water storage tank 14 that is a reference for starting boiling of the hot water in the hot water storage tank 14 is T1, the microcomputer 37 continuously measures the temperature in the hot water storage tank 14 via the temperature sensor 20. When the measured temperature is equal to or lower than T1, the fan 11, the pump 13 and the igniter 13a are operated to start boiling hot water in the hot water storage tank 14.

When the microcomputer 37 detects that the hot water temperature in the hot water storage tank 14 has reached a predetermined temperature via the temperature sensor 20, the microcomputer 13 stops the operation of the pump 13 and raises the hot water in the hot water storage tank 14. To stop. The fan 11 continues to operate for a post purge for a predetermined time after the pump 13 stops, and then stops. The igniter 13a operates only when the liquid fuel is ignited.

T1 is a temperature in the range of 36 to 50 ° C., and is input to the microcomputer 37 by an operation from the hot water remote controller 45 or the bathroom remote controller 46. The microcomputer 37 starts boiling the hot water in the hot water storage tank 14 at the time of power failure. Set as temperature. When the temperature at which boiling of hot water in the hot water storage tank 14 is started at normal time is T2, T2 is a temperature higher than T1, and in the present embodiment, the temperature is in the range of 60 to 70 ° C.
In this way, by adopting T1 lower than T2 as a temperature at which boiling of the hot water in the hot water storage tank 14 is started, the number of times of hot water boiling in the hot water storage tank 14 is reduced during a power failure as compared with the normal time. As a result, power consumption during a power failure can be suppressed.
And boiling of the hot water in the hot water storage tank 14 at the time of a power failure is complete | finished when the hot water in the hot water storage tank 14 reaches the temperature 5-10 degreeC higher than T1.

Next, the hot water boiling operation in the hot water storage tank 14 when the temperature of the hot water in the hot water storage tank 14 exceeds a predetermined value during a power failure will be described. The temperature of hot water in the hot water storage tank 14 is measured by the temperature sensor 20.
When the temperature of the hot water in the hot water storage tank 14 exceeds a predetermined value, boiling of the hot water in the hot water storage tank 14 is performed in accordance with the timing at which the hot water storage tank 14 is discharged.

As shown in FIGS. 1 and 2, the hot water supply passage 24 is provided with a flow rate sensor 47 connected to a microcomputer 37 on the hot water outlet side of the hot water storage tank 14. The microcomputer 37 is connected to the hot water storage tank by the flow rate sensor 47. The hot water from 14 can be detected.
When the microcomputer 37 detects the hot water from the hot water storage tank 14, the microcomputer 37 starts boiling the hot water in the hot water storage tank 14. When the microcomputer 37 detects that the hot water from the hot water storage tank 14 stops, the microcomputer 37 boils the hot water in the hot water storage tank 14. Stop raising.

Therefore, in the state where the temperature of the hot water in the hot water storage tank 14 exceeds a predetermined value at the time of a power failure, even if the hot water temperature in the hot water storage tank 14 is lowered due to heat radiation, the hot water storage tank 14 is used unless it is discharged from the faucet 22 or the shower 23. The hot water in the inside is not heated, and power consumption by the fan 11, the pump 13, and the igniter 13a is not performed. Therefore, at the time of a power failure, the amount of electric power stored in the secondary battery 16 is reduced, and the time during which the tap 22 and the shower 23 can be discharged can be extended.

As described above, in this embodiment, the boiling timing of hot water in the hot water storage tank 14 at the time of a power failure differs depending on the temperature of hot water in the hot water storage tank 14, but the hot water storage tank 14 at the time of a power failure The boiling time of hot water may not be changed depending on the temperature of hot water in the hot water storage tank 14. Below, the modification which does not change the boiling-up timing of the hot water of the hot water storage tank 14 at the time of a power failure according to the temperature of the hot water in the hot water storage tank 14 is demonstrated.

In the modification, regardless of the temperature of the hot water in the hot water storage tank 14, the boiling of the hot water in the hot water storage tank 14 is started at the time of a power failure based on the temperature of the hot water in the hot water storage tank 14 as in the normal time.
The temperature at which boiling of the hot water in the hot water storage tank 14 is started is lower than that during normal power failure, and the temperature at which boiling of the hot water in the hot water storage tank 14 is completed is the same at the time of power failure and normal. The specific spring start temperature is a temperature in the range of 60 to 70 ° C. during normal times and a temperature in the range of 40 to 50 ° C. during power failures.
Accordingly, the number of times the hot water is heated in the hot water storage tank 14 at the time of a power failure is reduced from the normal time, and the power consumption is suppressed by the power consumption of the igniter 13a at the time of ignition and the power consumption required for the post-purge of the fan 11 after extinguishing. Will be.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions and the like that do not depart from the gist are within the scope of the present invention.
For example, the burner device may be a gas fuel type. When the gas fuel type burner device is adopted, the supply amount adjusting means is a proportional valve provided in the gas pipe, and the flow rate of the gas fuel supplied to the combustion section is changed by adjusting the opening of the proportional valve. .
In addition, an additional circuit for heating the hot water in the bathtub may be provided. In this case, for the electric equipment provided in the additional circuit, power is not supplied at the time of a power failure, and priority is given to hot water supply to the faucet and the shower. be able to.

DESCRIPTION OF SYMBOLS 10: Hot water heater, 11: Fan, 12: Combustion part, 13: Pump (supply amount adjustment means), 13a: Igniter (ignition means), 14: Hot water storage tank, 15: Commercial power supply, 16: Secondary battery, 17: Water supply pipe, 18: Pressure reducing valve, 19: Combustion chamber, 20: Temperature sensor, 21: Burner device, 22: Faucet, 23: Shower, 24: Hot water supply channel, 25: Bathtub, 26: Hot water channel, 29: Mixing valve, 30: proportional valve, 31-33: temperature sensor, 34: on-off valve, 35: control device, 36: power supply circuit, 37: microcomputer, 38: converter, 39: inverter, 40: switch, 41: Service outlet, 42: housing, 43: air supply path, 44: temperature sensor, 45: hot water remote control, 46: bathroom remote control, 47: flow sensor

Claims (5)

A burner device comprising a fan, a combustion part to which air is supplied from the fan, a supply amount adjusting means for adjusting the flow rate of combustible fuel sent to the combustion part, and an ignition means, and hot water storage in which hot water is boiled by the burner apparatus A water heater having a tank and a secondary battery that is charged with power from a commercial power source,
The burner device normally operates with power supplied from the commercial power source to boil hot water in the hot water storage tank, and operates with power supplied from the secondary battery during power outage to operate hot water in the hot water storage tank. In addition, an upper limit is set for the number of times the hot water in the hot water tank is heated per power outage, and the number of times the hot water in the hot water tank is heated per power outage. Even after reaching the upper limit, the hot water heater is in a state where the hot water in the hot water storage tank is heated by a specific operation switch. A burner device comprising a fan, a combustion part to which air is supplied from the fan, a supply amount adjusting means for adjusting the flow rate of combustible fuel sent to the combustion part, and an ignition means, and hot water storage in which hot water is boiled by the burner apparatus A water heater having a tank and a secondary battery that is charged with power from a commercial power source,
The burner device normally operates with power supplied from the commercial power source to boil hot water in the hot water storage tank, and operates with power supplied from the secondary battery during power outage to operate hot water in the hot water storage tank. In addition, an upper limit is set for the number of times the hot water in the hot water tank is heated per power outage. When the temperature of the hot water is below a predetermined value, the hot water in the hot water storage tank is used as a reference, and when the temperature of the hot water in the hot water storage tank exceeds the predetermined value, the hot water storage tank is at a timing when the hot water is discharged. A water heater characterized by being combined. In the water heater according to claim 2 , when the temperature of the hot water in the hot water storage tank is not more than the predetermined value at the time of a power failure, a temperature lower than normal is set as a temperature at which boiling of the hot water in the hot water storage tank is started, A water heater for boiling water in the hot water storage tank. A burner device comprising a fan, a combustion part to which air is supplied from the fan, a supply amount adjusting means for adjusting the flow rate of combustible fuel sent to the combustion part, and an ignition means, and hot water storage in which hot water is boiled by the burner apparatus A water heater having a tank and a secondary battery that is charged with power from a commercial power source,
The burner device normally operates with power supplied from the commercial power source to boil hot water in the hot water storage tank, and operates with power supplied from the secondary battery during power outage to operate hot water in the hot water storage tank. In addition, an upper limit is set for the number of times the hot water in the hot water tank is heated per power outage, and the hot water in the hot water tank is heated both at normal times and during power outages. The hot water heater is characterized in that it is started on the basis of the temperature of hot water in the hot water storage tank, and the temperature at which the hot water in the hot water storage tank starts to be heated is lower than that during normal power outage. The water heater according to any one of claims 1 to 4 , wherein the combustible fuel is a liquid fuel, and the supply amount adjusting means is a pump.

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